since (the) year one

idiom

Definition of since (the) year one

US, informal
: for a very long time : since a time in the distant past That monument has been there since the year one.

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“Since (the) year one.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/since%20%28the%29%20year%20one. Accessed 20 Jan. 2021.

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